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  • American Association for the Advancement of Science (AAAS)  (4,666)
  • 1990-1994  (2,156)
  • 1980-1984  (1,810)
  • 1975-1979  (700)
  • 1955-1959
  • 1945-1949
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  • 11
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    Hubble space telescope observations of comet p/shoemaker-levy 9 (1993e) (1994)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1994-02-11
    Description: The Hubble Space Telescope observed the fragmented comet P/Shoemaker-Levy 9 (1993e) (P indicates that it is a periodic comet) on 1 July 1993. Approximately 20 individual nuclei and their comae were observed in images taken with the Planetary Camera. After subtraction of the comae light, the 11 brightest nuclei have magnitudes between approximately 23.7 and 24.8. Assuming that the geometric albedo is 0.04, these magnitudes imply that the nuclear diameters are in the range approximately 2.5 to 4.3 kilometers. If the density of each nucleus is 1 gram per cubic centimeter, the total energy deposited by the impact of these 11 nuclei into Jupiter's atmosphere next July will be approximately 4 x 10(30) ergs ( approximately 10(8) megatons of TNT). This latter number should be regarded as an upper limit because the nuclear magnitudes probably contain a small residual coma contribution. The Faint Object Spectrograph was used to search for fluorescence from OH, which is usually an excellent indicator of cometary activity. No OH emission was detected, and this can be translated into an upper limit on the water production rate of approximately 2 x 10(27) molecules per second.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Weaver, H A -- Feldman, P D -- A'hearn, M F -- Arpigny, C -- Brown, R A -- Helin, E F -- Levy, D H -- Marsden, B G -- Meech, K J -- Larson, S M -- Noll, K S -- Scotti, J V -- Sekanina, Z -- Shoemaker, C S -- Shoemaker, E M -- Smith, T E -- Storrs, A D -- Yeomans, D K -- Zellner, B -- New York, N.Y. -- Science. 1994 Feb 11;263(5148):787-91.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17770832" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 12
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    The clementine mission to the moon: scientific overview (1994)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1994-12-16
    Description: In the course of 71 days in lunar orbit, from 19 February to 3 May 1994, the Clementine spacecraft acquired just under two million digital images of the moon at visible and infrared wavelengths. These data are enabling the global mapping of the rock types of the lunar crust and the first detailed investigation of the geology of the lunar polar regions and the lunar far side. In addition, laser-ranging measurements provided the first view of the global topographic figure of the moon. The topography of many ancient impact basins has been measured, and a global map of the thickness of the lunar crust has been derived from the topography and gravity.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nozette, S -- Rustan, P -- Pleasance, L P -- Kordas, J F -- Lewis, I T -- Park, H S -- Priest, R E -- Horan, D M -- Regeon, P -- Lichtenberg, C L -- Shoemaker, E M -- Eliason, E M -- McEwen, A S -- Robinson, M S -- Spudis, P D -- Acton, C H -- Buratti, B J -- Duxbury, T C -- Baker, D N -- Jakosky, B M -- Blamont, J E -- Corson, M P -- Resnick, J H -- Rollins, C J -- Davies, M E -- Lucey, P G -- Malaret, E -- Massie, M A -- Pieters, C M -- Reisse, R A -- Simpson, R A -- Smith, D E -- Sorenson, T C -- Breugge, R W -- Zuber, M T -- New York, N.Y. -- Science. 1994 Dec 16;266(5192):1835-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17737076" target="_blank"〉PubMed〈/a〉
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    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 13
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    Superconductivity in SrCuO2-BaCuO2 Superlattices: Formation of Artificially Layered Superconducting Materials (1994)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1994-09-30
    Description: Pulsed-laser deposition was used to synthesize artificially layered high-temperature superconductors. Thin-film compounds were formed when the constraint of epitaxy was used to stabilize SrCuO(2)-BaCuO(2) superlattices in the infinite layer structure. Using this approach, two new structural families, Ba(2)Srn-1,Cun+1 O2n+2+delta and Ba(4)Srn-1 Cun+3O2n+6+delta have been synthesized; these families superconduct at temperatures as high as 70 kelvin.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Norton, D P -- Chakoumakos, B C -- Budai, J D -- Lowndes, D H -- Sales, B C -- Thompson, J R -- Christen, D K -- New York, N.Y. -- Science. 1994 Sep 30;265(5181):2074-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17811410" target="_blank"〉PubMed〈/a〉
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    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 14
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    State-to-State Rates for the D + H2(v = 1, j = 1) rarr HD(v', j') + H Reaction: Predictions and Measurements (1992)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1992-07-24
    Description: A fully quantal wavepacket approach to reactive scattering in which the best available H(3) potential energy surface was used enabled a comparison with experimentally determined rates for the D + H(2)(v = 1, j = 1) --〉 HD(v' = 0, 1, 2; j') + H reaction at significantly higher total energies (1.4 to 2.25 electron volts) than previously possible. The theoretical results are obtained over a sufficient range of conditions that a detailed simulation of the experiment was possible, thus making this a definitive comparison of experiment and theory. Good to excellent agreement is found for the vibrational branching ratios and for the rotational distributions within each product vibrational level. However, the calculated rotational distributions are slightly hotter than the experimentally measured ones. This small discrepancy is more marked for products for which a larger fraction of the total energy appears in translation. The most likely explanation for this behavior is that refinements are needed in the potential energy surface.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Neuhauser, D -- Judson, R S -- Kouri, D J -- Adelman, D E -- Shafer, N E -- Kliner, D A -- Zare, R N -- New York, N.Y. -- Science. 1992 Jul 24;257(5069):519-22.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17778685" target="_blank"〉PubMed〈/a〉
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 15
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    Preliminary results on the plasma environment of saturn from the pioneer 11 plasma analyzer experiment (1980)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1980-01-25
    Description: The Ames Research Center Pioneer 11 plasma analyzer experiment provided measurements of the solar wind interaction with Saturn and the character of the plasma environment within Saturn's magnetosphere. It is shown that Saturn has a detached bow shock wave and magnetopause quite similar to those at Earth and Jupiter. The scale size of the interaction region for Saturn is roughly one-third that at Jupiter, but Saturn's magnetosphere is equally responsive to changes in the solar wind dynamic pressure. Saturn's outer magnetosphere is inflated, as evidenced by the observation of large fluxes of corotating plasma. It is postulated that Saturn's magnetosphere may undergo a large expansion when the solar wind pressure is greatly diminished by the presence of Jupiter's extended magnetospheric tail when the two planets are approximately aligned along the same solar radial vector.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wolfe, J H -- Mihalov, J D -- Collard, H R -- McKibbin, D D -- Frank, L A -- Intriligator, D S -- New York, N.Y. -- Science. 1980 Jan 25;207(4429):403-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17833548" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 16
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    Giant panda paternity (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-03-16
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉O'Brien, S J -- Goldman, D -- Knight, J -- Moore, H D -- Wildt, D E -- Bush, M -- Montali, R J -- Kleiman, D -- New York, N.Y. -- Science. 1984 Mar 16;223(4641):1127-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6701515" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Carnivora ; Male ; *Paternity ; Polymorphism, Genetic ; Proteins/analysis
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    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 17
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    Nonpneumonic, short-incubation-period Legionellosis (Pontiac fever) in men who cleaned a steam turbine condenser (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-08-17
    Description: Pontiac fever affected ten men who had cleaned a steam turbine condenser with compressed air. Previous epidemics of Pontiac fever and Legionnaires' disease--both caused by Legionella Pneumophila (proposed sp. nov.)--involved "airborne spread" from air-conditioning cooling towers or evaporative condensers. Aerosols of contaminated water in heat-rejection systems appear to be important sources of epidemic legionellosis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fraser, D W -- Deubner, D C -- Hill, D L -- Gilliam, D K -- New York, N.Y. -- Science. 1979 Aug 17;205(4407):690-1.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/462175" target="_blank"〉PubMed〈/a〉
    Keywords: Adolescent ; Air Microbiology ; Humans ; Legionnaires' Disease/*etiology/microbiology/transmission ; Male ; Occupational Medicine ; Time Factors
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  • 18
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    Regulation of leucine metabolism in man: a stable isotope study (1981)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1981-12-04
    Description: Leucine catabolism is regulated by either of the first two degradative steps: (reversible) transamination to the keto acid or subsequent decarboxylation. A method is described to measure rates of leucine transamination, reamination, and keto acid oxidation. The method is applied directly to humans by infusing the nonradioactive tracer, L-[15N,1-13C]leucine. Leucine transamination was found to be operating several times faster than the keto acid decarboxylation and to be of equal magnitude in adult human males under two different dietary conditions, postabsorptive and fed. These results indicate that decarboxylation, not transamination, is the rate-limiting step in normal human leucine metabolism.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Matthews, D E -- Bier, D M -- Rennie, M J -- Edwards, R H -- Halliday, D -- Millward, D J -- Clugston, G A -- AM-25994/AM/NIADDK NIH HHS/ -- HD-10667/HD/NICHD NIH HHS/ -- RR-00954/RR/NCRR NIH HHS/ -- New York, N.Y. -- Science. 1981 Dec 4;214(4525):1129-31.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7302583" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; Carbon Isotopes ; Humans ; Kinetics ; Leucine/*metabolism ; Male ; Models, Biological ; Nitrogen Isotopes ; Oxidation-Reduction
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 19
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    Dimethyl and monomethyl sulfate: presence in coal fly ash and airborne particulate matter (1980)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1980-01-11
    Description: Dimethyl sulfate and its hydrolysis product monomethyl sulfate have been found at concentrations as high as 830 parts per million in fly ash and in airborne particulate matter from coal combustion processes. This discovery poses a new environmental problem because of the mutagenic and carcinogenic properties of these compounds.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lee, M L -- Later, D W -- Rollins, D K -- Eatough, D J -- Hansen, L D -- New York, N.Y. -- Science. 1980 Jan 11;207(4427):186-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7350652" target="_blank"〉PubMed〈/a〉
    Keywords: Air Pollutants/*analysis ; Carcinogens/analysis ; *Coal ; Power Plants ; Sulfuric Acids/*analysis
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 20
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    A new redox cofactor in eukaryotic enzymes: 6-hydroxydopa at the active site of bovine serum amine oxidase (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-05-25
    Description: An active site, cofactor-containing peptide has been obtained in high yield from bovine serum amine oxidase. Sequencing of this pentapeptide indicates: Leu-Asn-X-Asp-Tyr. Analysis of the peptide by mass spectrometry, ultraviolet-visible spectroscopy, and proton nuclear magnetic resonance leads to the identification of X as 6-hydroxydopa. This result indicates that, contrary to previous proposals, pyrroloquinoline quinone is not the active site cofactor in mammalian copper amine oxidases. Although 6-hydroxydopa has been implicated in neurotoxicity, the data presented suggest that this compound has a functional role at an enzyme active site.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Janes, S M -- Mu, D -- Wemmer, D -- Smith, A J -- Kaur, S -- Maltby, D -- Burlingame, A L -- Klinman, J P -- GM 39296/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1990 May 25;248(4958):981-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, University of California, Berkeley 94720.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2111581" target="_blank"〉PubMed〈/a〉
    Keywords: *Amine Oxidase (Copper-Containing) ; Amino Acid Sequence ; Animals ; Binding Sites ; Cattle ; Copper ; Dihydroxyphenylalanine/*analogs & derivatives/metabolism ; Magnetic Resonance Spectroscopy ; Mass Spectrometry ; Molecular Sequence Data ; Oxidoreductases/metabolism ; Oxidoreductases Acting on CH-NH Group Donors/blood/*metabolism ; Peptide Fragments/analysis/chemical synthesis ; Quinones/metabolism ; Spectrophotometry, Ultraviolet
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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